Advertisement

Notch Fatigue Behaviour of Shot Peened High-Strength Aluminium Alloys: Role of the Residual Stress Field Ahead of the Notch Root

  • M. BenedettiEmail author
  • V. Fontanari
  • M. Allahkarami
  • J. C. Hanan
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

The present paper is aimed at investigating the effect of shot peening on the fatigue behavior of Al-7075-T651 samples carrying different types of notches. The Wöhler S–N curves were determined by pulsating bending for the different experimental conditions. A different improvement of the fatigue strength was found, i.e. a different effectiveness of the treatment for different notch geometries: the more critical notches received the larger beneficial effect by shot peening treatment in terms of reduction of the notch fatigue sensitivity and increment of the notch fatigue strength. The fatigue improvements with respect to the unpeened condition were discussed accounting for the residual stress effects. The residual stress field ahead of the notch root was evaluated by means of a numerical technique, making use of XRD measurements on the plain peened specimens. The numerical predictions were then compared with the results of XRD measurements conducted in the vicinity of the notch root of the peened notched samples.

Keywords

Shot peening Notch fatigue Al-7075-T651 Residual stresses 

References

  1. 1.
    ASM handbook, Properties and selection: nonferrous alloys and special-purpose materials, Vol. 2, 10th edition, Materials Park, Ohio: American society for metals, 1991.Google Scholar
  2. 2.
    Bian JC, Tokaji K, Ogawa T (1994) Notch sensitivity of aluminium-lithium alloys in fatigue. J Soc Mat Sci Japan 43:840–846CrossRefGoogle Scholar
  3. 3.
    Guagliano M, Vergani L (2004) An approach for prediction of fatigue strength of shot peened components. Eng Fract Mech 71:501–512CrossRefGoogle Scholar
  4. 4.
    Wagner L (1999) Mechanical surface treatments on titanium, aluminum and magnesium alloy. Mater Sci Eng A263:210–216CrossRefGoogle Scholar
  5. 5.
    McClung RC (2007) A literature survey on the stability and significance of residual stresses during fatigue. Fatigue Fracture Eng Mater Struct 30:173–205CrossRefGoogle Scholar
  6. 6.
    Benedetti M, Fontanari V, Scardi P, Ricardo CLA, Bandini M (2009) Reverse bending fatigue of shot peened 7075-T651 aluminium alloy: the role of residual stress relaxation. Int J Fatigue 31:1225–1236CrossRefGoogle Scholar
  7. 7.
    Benedetti M, Fontanari V, Monelli BD (2010) Numerical simulation of residual stress relaxation in shot peened high-strength aluminium alloys under reverse bending fatigue. ASME J Eng Mater Technol 132:011012-1-9CrossRefGoogle Scholar
  8. 8.
    Benedetti M, Fontanari V, Santus C, Bandini M (2010) Notch fatigue behaviour of shot peened high-strength aluminium alloys: Experiments and predictions using a critical distance method. Int J Fatigue 32:1600–1611CrossRefGoogle Scholar
  9. 9.
    Oguri K (2011) Fatigue life enhancement of aluminum alloy for aircraft by Fine Particle Shot Peening (FPSP). J Mat Proc Technol 211:1395–1399CrossRefGoogle Scholar
  10. 10.
    Benedetti M, Fontanari V, Bandini M (2014) Very high-cycle fatigue resistance of shot peened high-strength aluminium alloys: role of surface morphology. Proceedings of the SEM 2014 annual conference & exposition on experimental and applied mechanics, Greenville, SC, USA, 2–5 June 2014Google Scholar
  11. 11.
    Beghini M, Bertini L (1990) Residual stress modelling by experimental measurements and finite elements analysis. J Strain Anal 25(2):103–108CrossRefGoogle Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2015

Authors and Affiliations

  • M. Benedetti
    • 1
    Email author
  • V. Fontanari
    • 1
  • M. Allahkarami
    • 2
  • J. C. Hanan
    • 2
  1. 1.Department of Industrial EngineeringUniversity of TrentoTrentoItaly
  2. 2.Department of Mechanical and Aerospace EngineeringOklahoma State UniversityTulsaUSA

Personalised recommendations